package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.Arrays;
import java.util.List;

@Service
public class SetmealServiceImpl implements SetmealService {
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;
    /**
     *分页查询
     */
    @Override
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 新增套餐
     */
    @Override
    public void saveWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        // 向套餐表插入数据
        setmealMapper.insert(setmeal);
        // 获取生成的套餐id
        Long setmealId = setmeal.getId();
        // 向套餐菜品关系表插入n条数据
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if (setmealDishes != null && setmealDishes.size() > 0) {
            setmealDishes.forEach(setmealDish -> setmealDish.setSetmealId(setmealId));
            // 向套餐菜品关系表插入n条数据
            setmealDishMapper.insertBatch(setmealDishes);
        }

    }

    /**
     * 批量删除套餐，同时需要删除套餐和菜品的关联数据
     */
    @Override
    @Transactional
    public void delete(List<Long> ids) {
        // 查询当前删除的套餐状态，是否可用
        List<Setmeal> setmealList = setmealMapper.getSetmealByIds(ids);
        setmealList.forEach(setmeal -> {
            if (setmeal.getStatus() == 1) {
                // 处于起售状态，不能删除
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        });
        // 删除套餐数据
        setmealMapper.deleteBatch(ids);
        // 删除套餐和菜品的关联数据
        setmealDishMapper.deleteBySetmealIds(ids);
    }
    /**
     * 根据id查询套餐
     */
    @Override
    public SetmealVO getByIdWithDish(Long id) {
        // 查询套餐数据
        SetmealVO setmealVO = setmealMapper.getByIdWithDish(id);
        // 查询套餐和菜品的关联数据
        List<SetmealDish> bySetmealId = setmealDishMapper.getBySetmealId(id);
        setmealVO.setSetmealDishes(bySetmealId);
        return setmealVO;
    }
    /**
     * 修改套餐
     */
    @Override
    public void updateWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        // 修改套餐
        setmealMapper.update(setmeal);
        // 删除套餐和菜品的关联数据
        Long setmealId = setmeal.getId();
        setmealDishMapper.deleteBySetmealIds(Arrays.asList(setmealId));
        // 重新插入新的套餐和菜品的关联数据
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        if (setmealDishes != null && setmealDishes.size() > 0) {
            setmealDishes.forEach(dish -> dish.setSetmealId(setmealId));
            // 插入套餐和菜品的关联数据
            setmealDishMapper.insertBatch(setmealDishes);
        }
    }

    /**
     * 起售、停售套餐
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        //起售套餐时，判断套餐内是否有停售菜品，有停售菜品提示"套餐内包含未启售菜品，无法启售"
        if (status == StatusConstant.ENABLE) {
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if(dishList != null && dishList.size() > 0){
                dishList.forEach(dish -> {
                    if(StatusConstant.DISABLE == dish.getStatus()){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }

        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }
    /**
     * 条件查询
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据id查询菜品选项
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
